Kodi 17 - Shared Mysqldatabase: Problem with pictures and covers

i have here two kodi 17. One phy device for the livingroom with Gentoo. And one virtualmachine with Ubuntu 16.04 for the webinterface and management. It is working but on the webinterface of the VM i have/had no covers, no pictures... but only in the webinterface. On the Kodiinterface everything is there.

Now I've been watching that when i display a movie/actor/cover... onc in the kodiinterface it will be also displayed in the webinterface. I haven't this problem on the gentoo phy machine. Is there a special to do for shared database, some cache or similar...?